re: What are your workplace rules regarding firearms?

Yep
This happened where I work just last year. The coast guard did the search. They searched all lunch boxes, we emptied pockets, they had dogs in the parking lot. I had to leave my steak knife in my truck. I don't know if they found drugs, but they did find a couple firearms and some ammo in personal vehicles. No one lost their jobs over it, though I'm sure they could have. They were simply told not to bring them back.